While running, a person dissipates about 0.60 j of mechanical energy per step per kilogram of body mass. if a 51-kg person develops a power of 67 w during a race, how fast is the person running? (assume a running step is 1.5 m long.) ?

Question

Physics

Geovanni Mclean

4 May, 15:56

While running, a person dissipates about 0.60 j of mechanical energy per step per kilogram of body mass. if a 51-kg person develops a power of 67 w during a race, how fast is the person running? (assume a running step is 1.5 m long.) ?

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Kaylyn Carney · Answer 1

Given: 0.6J/1.5m/kg

For the particular person, since he is 51kg, every step he ran would yield 30.6J

67 W = 67J/S

Time = 30.6J / 67J/s = 0.4567164179s

Speed = 1.5m / 0.4567164179s

= 3.28m/s